functional servicing plan - cambridge, ontario · functional servicing report for the cambridge...
TRANSCRIPT
Functional Servicing Report
For the
Cambridge Hindu Society
Proposed Site Plan and Rezoning Application
For lands located at
Boxwood Drive
Part of Lot 27, Beasley’s Broken Front Connection Part 11
Plan 67R-2561
File D01/17
City of Cambridge, Region of Waterloo
July 23, 2017
Ram Engineering Inc.
1192 White Clover Way
Mississauga
Ontario L5V 1K8
905 567 1215
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
2
June 12, 2017
Mr. Dwarka Persaud
4 Highgrove Court
Cambridge, Ontario N3H 4R8
Re: Functional Site Servicing Report, Stormwater Management and Grading Plan
Proposed Building at Boxwood Drive for Cambridge Hindu Society
Area bounded by Boxwood Drive, Royal Oak Road and Cherry Blossom Road
Part of Lot 27, Beasley’s Broken Front Concession, Part 11 Plan 67R-2561
City of Cambridge, Region of Waterloo
City’s File: D01/17
Enclosed is the Functional Servicing Plan for the Cambridge Hindu Society property, located to the west
of Boxwood Drive, south-east of Royal Oak Road and north of Cherry Blossom Road in the City of
Cambridge.
This document addresses site grading, sanitary servicing and stormwater for the Cambridge Hindu Society
land-holdings at the above location. This service report is in support for a rezoning application to the City
of Cambridge in the Region of Waterloo.
We trust this report acceptably show that the development can be adequately serviced.
Respectfully submitted,
Ram Dharamdial, M. Eng., P. Eng. Mahadeo Singh P.Eng.
Ram Engineering Inc. MPS Engineering Inc.
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
3
1.0 Introduction
The survey for the property at the south east corner of Boxwood Drive and Cherry Blossom Road
was done by MacDonald – Tamblyn Surveying Ltd. The legal description is Part of Lot 27,
Beasley’s Broken Front Concession, Part 11 Plan 67R-2561, City of Cambridge, and Regional
Municipality of Waterloo.
Ram Engineering Inc. and MPS Engineering Inc. are authorized by the Cambridge Hindu Society
to undertake the preparation of a Functional Servicing Report for the proposed Cambridge
Hindu Temple located as a triangular parcel at the intersections of Cherry Blossom Road (east-
west), Royal Oak Road (northeast – southwest) and Boxwood Drive (north-south) in the City of
Cambridge.
This Functional Service Report for the subject lands was prepared to conform to the services
that exist within the vicinity of the site; and, other services proposed by the City of Cambridge
and the Region of Waterloo that can be accessed, in particular the sanitary connection.
In this context, a comprehensive analysis on the feasibility of servicing the lands was undertaken
to determine, the adequacy of the services for the proposed institutional development plan.
This Functional Servicing Report (FSP) covers the grading, storm sewer design, storm-water
management and water supply as required by the servicing policies of the City of Cambridge in
the Region of Waterloo.
2.0 Land Use
The property is 0.9066 ha, which is determined by measurement from a survey plan provided by
MacDonald – Tamblyn Surveying Ltd. The lands are Part of Part of Lot 27, Beasley’s Broken
Front Concession, Part 11 Plan 67R-2561, City of Cambridge in the Regional Municipality of
Waterloo.
The site will be developed partly for a place of worship. Of the 0.9066 ha, 0.1314 ha will be
undeveloped. This undeveloped area will not be considered as part of the stormwater
management plan.
The present designation is “Future Urban Reserve in the City’s Official Plan (2012)” and is zoned
(E) A1 in the City’s Zoning By-Law. The site presently has no building and conforms to applicable
standards and specifications of the City of Cambridge and the Region of Waterloo.
Policy 8.1.6 of the City’s Official Plan encourages a range of institutional, recreational and social
uses as part of the redevelopment. It is intended to conform to the future designation of the
site.
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
4
The proposed site plan shows a two-story building. The area within the lot will be graded and
landscaped in accordance with the requirements set out in the site plan, all to the satisfaction of
the City of Cambridge.
Within the development area, the following land use is being proposed:
Landscape = 0.2070 ha
Paved areas = 0.5122 ha
Roof = 0.0568 ha
Total = 0.7750 ha
3.0 Drainage
3.1 Existing Drainage
The subject property drains naturally to a ditch leading to an existing 450 mm culvert across
Royal Oak Road.
External flows are conveyed to a roadside ditch along Cherry Blossom Road, Boxwood Drive and
Royal Oak Road. There are two existing 450 mm culverts: one across Cherry Blossom Road and
the other across Boxwood Drive. Both culverts are flowing to the 450 mm culvert across Royal
Oak Road via an existing ditch within the subject lands.
3.1 Proposed Drainage
All grading within the site for the Cambridge Hindu Temple lands is proposed to be done in such
a manner that the existing drainage for the lands are maintained. External flows and controlled
site runoff will be directed to the existing culvert across Royal Oak Road. This will maintain the
existing condition, such that no upstream nor flooding beyond existing property will result from
the development.
The proposed post development drainage pattern for the minor and major systems will be
integrated, such that surface storage will be provided to the extent of 170 m3 to maintain pre to
post development drainage conditions. The details are detailed as follows:
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
5
Storage on site
CB 1 25 m3
CB 2 30 m3
CBMH 1 20 m3
CB 4 12 m3
CB 3 24 m3
CBMH 2 52 m3
CBMH 3 13 m3
TOTAL 176 m3
The minimum storage required is 171 m3. Details of the calculations are presented in Section
3.3.3 of this report.
Any flow greater than the 100 year post development flow will be directed to the existing
watercourse at the south east corner of the property, all under the jurisdiction of City of
Cambridge and GRCA.
A preliminary analysis is done to show that pre and post development flows for the site are
equal. This agrees/complies with the stormwater management policies and guidelines for the
approval agencies of City of Cambridge and GRCA.
3.2 Minor drainage system
The network of storm sewer with catch basins and catch basin manholes are adequately
provided on site to capture the 5 year post development flows and convey it to the culvert
crossing Royal Oak. To prevent frequent flooding within the site, at detailed design, there would
be considerations to prevent surface flooding.
Post development flows will be reduced to their predevelopment levels for all storms from the 2
to 100 year event. For less frequent events (greater than 100 year event) a major system flow
path is provided to allow the flow to follow the same path as the pre-development condition.
3.3 Stormwater management – quantity control
The City requires that flood mitigation for the site be done so that the 100 year post
development flows is attenuated to the 5 year pre-development level.
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
6
3.3.1 Landuse
The proposed land use and the determination of the runoff coefficient are as follows:
Land use for development
area
Paved area = 5122 m2 C= 0.90
Landscape = 2070 m2 C= 0.25
Roof = 558 m2 C= 0.90
Total = 7750 m2
Average runoff coefficient, Cave = 0.73
Pre-development Cave = 0.25
3.3.2 Rational Method
The Rational method is typically used in the calculation of flows for sites typical of the proposed
development. The Rational Method is as follows:
Q = 0.00278 CiA
where: Q = flow in m3 /s;
i = rainfall intensity, mm/hr;
C = runoff coefficient;
A = area in hectares.
3.3.3 Rainfall data
The City of Cambridge rainfall intensities are used in the calculations of runoff from the site. For
the 5 year storm, the intensity is calculated with the following relationship:
For a specific storm, the intensity is calculated with the following relationship:
C
c Bt
Ai
)(
Where i100 = rainfall intensity corresponding to the 100 year level, mm/hr
tc = time of concentration, 10minutes
A = 3015.1
B = 21
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
7
C = 0.87
For the 5 year storm, the intensity is calculated with the following relationship:
A = 1219.8
B = 10
C = 0.823
3.3.4 Allowable release rate
The details of the calculations with the Rational Method is detailed below:
Q = 0.00278 CiA
where: Q = flow in m3 /s;
i = 101.56 mm/hr;
For the pre-development 5 year storm,
Qallowable = 0.00278 x 0.25 x 0.7730 x 88.18 = 0.055 m3/s
This is the flows that will be release to the culvert via the minor system to the culvert across
Royal Oak Drive.
3.3.5 Calculations of storage
The modified Rational Method is used to calculate the storage for the site. The Modified
Rational Method is applied as explained in “Urban Stormwater Management Special Report No.
49”, American Public Works Association, 1981 (pages 52 to 56).
The calculations show that 171 m3 of storage is required to attenuate the 100 year post
development flows to the 5 year pre-development levels.
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
8
Calculations of the storage for the 100 year storm
Rainfall data - 100 year storm
A= 3015.1
B= 21
C= 0.87
Area (ha)= 0.7750
C= 0.7264
Qrelease= 0.0547 m3/s
Release Inflow Outflow
Time Intensity Rate Qrain Volume Volume Storage
(min) (mm/hr) (m3/s) (m3/s) (m3) (m3) (m3)
10.00 151.99 0.0547 0.2379 142.72 51.74 90.98 15.00 133.45 0.0547 0.2088 187.96 67.35 120.61 20.00 119.17 0.0547 0.1865 223.81 82.98 140.83 25.00 107.82 0.0547 0.1687 253.11 98.62 154.49 30.00 98.56 0.0547 0.1543 277.65 114.27 163.39 35.00 90.86 0.0547 0.1422 298.62 129.92 168.69 40.00 84.35 0.0547 0.1320 316.80 145.59 171.21 45.00 78.76 0.0547 0.1233 332.80 161.27 171.53 50.00 73.91 0.0547 0.1157 347.01 176.95 170.06 55.00 69.66 0.0547 0.1090 359.77 192.64 167.13 60.00 65.91 0.0547 0.1031 371.31 208.33 162.98 65.00 62.56 0.0547 0.0979 381.83 224.03 157.80 70.00 59.56 0.0547 0.0932 391.47 239.74 151.73
Storage required to control 100 year post to 10 year allowable = 171.53 m3
3.3.6 Calculations of orifice
Storm water from the site will be discharged at the peak allowable rate of 0.0547 m3/sec via a 130 mm Ø orifice plate/ tube into the storm sewer on Royal Oak Drive.
The orifice equation was used to size the orifice to control the flow to the municipal system.
ghCAQ 2
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
9
Where Q = discharge (0.073m3/s) g= gravity (9.81 m2/s) A= area of orifice (m2) C= orifice coefficient (0.82) h= head (2.63m)
The head on the orifice is calculated as follows:
Water level = 306.40 m
Invert at orifice = 304.14 m
Size of orifice = 0.130 m
Head = 2.19 m
The size of the orifice is calculated as follows:
Q = 0.0547 m3/s
C = 0.62
h= 2.19 m3/s
Q= C A (2gh)0.5
A= 0.0134 m2
d= 131 mm
A diameter of 130 mm is proposed.
3.4 Stormwater management – Quality control
Quality control is required by the City and MOECC. The pavement areas generate runoff
with sands, oil and grit, which is considered polluted to be discharged to any receiving
system.
The City and MOECC typically requires Level 1 (80% Total Suspended Sediment removal)
where the level of protection is indeterminate for the receiving stream.
A STC 300 is determined to be adequate for the site development. This unit will remove
83% TSS.
3.5 Erosion and sediment control
During construction, there would be the potential for erosion to take place, and
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
10
sediments to move within and out of the site. This is environmentally unacceptable. To minimize the impact, the following measures should be implemented:
1. All sediment and siltation control measures shall be implemented by the
contractor before the start of construction, where it is appropriate. 2. A silt fence as per the City of Cambridge standard should be installed around the
perimeter of the site. 3. A mud mat should be placed at the entrance/access point of the construction site.
The contractor should follow the City of Cambridge Standard for its design and implementation.
4. Existing catch basins and newly constructed one should be protected by sediment catch basin barriers as per the City standards.
5. If the construction is delayed for more than 30 days, all bare areas should be seeded.
6. The municipal road should be kept clean of mud and dirt; it should be cleaned at least once a week, or as required by the City of Cambridge.
The construction engineer should inspect the erosion and sediment control devices frequently and after major storm events to make sure that they are functional. Repairs should be effected as appropriate. An erosion and sediment control plan would be part of the submission to the City for the detail design.
4.0 Sanitary Servicing
There is an existing sanitary sewer gravity main on Boxwood Drive and a sanitary force main on
Cherry Blossom Road that is connected to the existing Pumping Station. This existing service on
Boxwood Drive is adequate to service the site as determined by the City of Cambridge.
A connection is proposed from the subject property via approximately a 160m length of 200 mm
diameter gravity sanitary sewer on the east side of Boxwood Drive. The sewer will flow
northerly to terminate into an existing sanitary manhole #SA38, thence to an existing 200 mm
diameter sanitary before it discharges in an easterly direction via an existing 450mm sanitary
trunk to the pumping station property. Connections are shown on the drawings.
The main floor of the building will be connected to the proposed 200 dia. sanitary service line.
The basement sanitary sewer will be connected by way of a grinder pump installed in the
basement. All flows from the lower level will be pumped and connected to the upper level
sewer described above in accordance with Section 7 of the Ontario Building Code
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
11
5.0 Water Supply
The existing water service for the development area is an existing 450 mm diameter watermain
east west direction on the north side of Cherry Blossom Road and Royal Oak Road. This
watermain is fronting the property and will be utilized for servicing.
A 150mm diameter water service is needed to service the proposed building. This service will be
installed in accordance with City Standard C154 to the satisfaction of the City of Cambridge and
the Region of Waterloo.
A 150-diameter connection will be adequate for fire and domestic demand. The building will
have a sprinkler system; hence, the need for a 150mm fire connection.
There are existing hydrants on the north side of Cherry Blossom Drive that can service the
proposed site.
There is a need for a sprinkler system. Hence, a new 150 mm line will be tapped from the
existing 450mm watermain.
6. Design summary
The Functional Servicing Report for the Cambridge Hindu Temple holdings, addressed the key
servicing requirements for servicing of the proposed development. Services considered are:
• Sanitary sewers - 200mm sanitary connection to City sewer on Boxwood Drive
• Water supply – a 150 mm connection to the existing 450mm City trunk on Cherry Blossom
Drive. This will serve for fire and domestic use
• Storm-water management - 171 m3 of storage is provided with a 130 mm orifice to manage
the stormwater runoff from the development. A STC 300 proposed for water quality,
Runoff from the site will be conveyed to the existing culvert outlet across Royal Oak Drive.
• Grading – consist with the natural grade of the lands.
Ram Engineering Inc. Cambridge Hindu Temple Mississauga, Ontario Cambridge, Ontario
12
We respectfully submit this proposal on behalf of our client the “Cambridge Hindu Temple” in
support of their re-zoning application. All the required services can be provided to meet the City
of Cambridge, the Region of Waterloo and the GRCA standards and specifications, applicable to
the servicing of the site.
Respectfully submitted,
Ram Dharamdial, P. Eng. Mahadeo Singh P.Eng.
Ram Engineering Inc. MPS Engineering Inc.